The cause of extreme weather

Global warming is the background of frequent extreme weather and climate events. According to the data of the World Meteorological Organization, the global surface temperature in June and April 2007 was 65,438 0.89℃ and 65,438 0.37℃ higher than the historical average, respectively, both exceeding the highest level of 65,438 0.998, which was the highest value in the same period on record. In 2006, the national average annual temperature was higher than normal 1. 1℃, which was the warmest year since 195 1. From June to July in 20 13, the national average temperature was higher than normal 1.4℃, which was the highest since 195 1 and the continuous/kloc-0 since1997. The winter temperature in China is also obviously high, and there have been 2 1 warm winters since 1986. On February 5, 20 13, the highest temperature in Beijing reached 16.0℃, the highest in the same period since meteorological data were available for 1840. On February 6th, the highest temperature in Nanjing reached 23.9℃, which is also the highest temperature in the same period once in a hundred years.